Practicability Research About Monitoring Corrosion Situation Of The Inner Of The Chimney Based On Four-rotor UAV

During thermal power generation,the inner wall of chimney is continuously invaded by corrosion brought by discharged gas.As chimney using time prolonged,this kind of corrosion may get worse and worse,even damage production safety of thermal power generation.So it is necessary to monitor the condition of inner walls regularly.At present,the most common and effective way of monitoring is using rope or elevators to send workers into the chimney from the top of it and then evaluate corrosion degree personally.However,this approach is not only time-wasting,but also has potential harm on worker's safety.Based on above problems,this essay proposes a new method of inner walls' corrosion monitoring through a four rotor unmanned aerial vehicle(UVA).The main contents of this essay are summarized as follows:Firstly,general introduction of thermal power generation,four rotor UVA and current development of inner wall corrosion monitoring methods,a detailed introduction of the causes of all corrosions and existing method of inner walls' corrosion monitoring.Secondly,analysis about actual demand of aerial photography and its environment with corresponding design: two four-rotor unmanned gyroplanes,wireless relay node,upper machine and implement aerial remote control are used in this research.They will work like this.Four unmanned gyroplane with relay nodes will hover beyond chimney mouth.Monitoring unmanned gyroplane will then begin aerial photography inside the chimneys.During the process,upper machine will be located on ground outside the chimneys and the connection between the unmanned gyroplane and the upper machine will be realized by relay nodes.Thirdly,appropriate frame material,airborne and aerial photography equipment will be specially selected according to detail application situation of four unmanned planes and aerial scenes.Hovering of unmanned planes will be controlled by fuzzy self-tuning PID controller.And there is a fundamental part in this research to realize the communication,the relay nodes,which is centered by STM32 single chip microcomputer.n RF24L01+PA and 2dbi gain 5.8GHz omnidirectional antenna functions as wireless communication module.Corresponding upper machine is also well prepared for the research.Fourthly,when carrying on image matching experiment,SIFT algorithm is applied into image matching and images matched each other are merged through weighted average merging method.This can finally lead to the accomplishment of mosaic experiment of images caught.